[bgl-discuss] peak bandwidth

[hongzhang shan <hshan@xxxxxxx>]

Hi,

I am testing STREAMS benchmark and Apex-Map benchmark on bluegene.
Both codes meaasure the available bandwidth. I find that no matter how 
small
data sets I use, or what data pattern I access, I could only get around 
3GB/s/cpu
bandwidth at most. This is only around 1/3 of 11.2GB/s peak.

The compiler option I used is : blrts_xlc -O4 -qarch=440. I am 
wondering whether
I did not use the right option.

 Also I am wondering whether somebody has play around with the memory 
bandwidth before
on bluegene and get some good performance, such as over 5GB/s. If so, 
could you
let me know ?

Thanks a lot!

shan

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